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    <title>PDF文件展示</title>
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</head>
<body>
    <div class="container">
        <header>
            <h1>PDF文件展示</h1>
            <p>以下是3个PDF文件的有序展示</p>
        </header>
        
        <main>
            <section class="pdf-section">
                <h2>PDF文件 1</h2>
                <div class="pdf-container">
                    <iframe src="pdf1.pdf" class="pdf-embed" frameborder="0"></iframe>
                </div>
            </section>
            
            <section class="pdf-section">
                <h2>PDF文件 2</h2>
                <div class="pdf-container">
                    <iframe src="pdf2.pdf" class="pdf-embed" frameborder="0"></iframe>
                </div>
            </section>
            
            <section class="pdf-section">
                <h2>PDF文件 3</h2>
                <div class="pdf-container">
                    <iframe src="pdf3.pdf" class="pdf-embed" frameborder="0"></iframe>
                </div>
            </section>
        </main>
        
        <footer>
            <p>&copy; 2023 PDF文件展示页面</p>
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